987 / | HD | ORGANIC COMPOUNDS CONTAINING A Bi, Sb, As, OR P ATOM OR CONTAINING A METAL ATOM OF THE 6TH TO 8TH GROUP OF THE PERIODIC SYSTEM |
350 | DF | PHOSPHORUS CONTAINING AT LEAST ONE NITROGEN ATOM AS SOLE HETERO ATOM (9/65) {4} |
352 | DF | .~ Ring contains three nitrogen atoms (9/65C) {2} |
354 | .~.~ Five-membered ring contains the three N atoms (9/65C5; 9/65C5E; 9/65C5G; 9/65C5K; 9/65C5R; 9/65C5V) |